Bet you have some loose junk in the carb. Since the main jet sits low it can clog up easy form any small piece of dirt or rust. I would pull the carb drain plug out of the bottom and let fuel flow a couple minutes. Catch it so you can use it and also to look for dirt etc in it. Also did you use a small wire to poke out the little hole in the main jet?? If not then do so it can only help. As for comparing a Weber carb on an Alfa to that car it would be like comparing a Model T to a Corvette. Years ago I had a 1967 Alra Roemor which had 2-2 barrel side draft Webers on it and boy was that a fast car
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